Minor tweek for WXPM

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4561 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/thread.h

@@ -422,6 +422,9 @@ public:
 
     // returns TRUE if the main thread has GUI lock
     extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
+    // return TRUE if the main thread is waiting for some other to terminate:
+    // wxApp then should block all "dangerous" messages
+    extern bool WXDLLEXPORT wxIsWaitingForThread();
 #else // !MSW && !PM
     // implement wxCriticalSection using mutexes
     inline wxCriticalSection::wxCriticalSection() { }